Yeah it is supposed to be tough, it is!
BUT, if you play your best game, and you know when that is, regardless of what the buy in is, I think you can go far. I know when it is a cheap buy in it is easier to make some calls that you wouldn't if it were an expensive buy in, but it does work! Give each tournament 100%, be CONFIDENT, watch everything that is going on, build your bankroll, and never look back!